  1: 1! + 1 =  2 
  2: 2! + 1 =  3 
  3: 3! - 1 =  5 
  4: 3! + 1 =  7 
  5: 4! - 1 =  23 
  6: 6! - 1 =  719 
  7: 7! - 1 =  5039 
  8: 11! + 1 =  39916801 
  9: 12! - 1 =  479001599 
 10: 14! - 1 =  87178291199